Pull the rip cord provided to start the internal gyro spinning. Then grip Strength Ball and start twisting your wrists, while controlling the gyroscopic forces. The built-in Revometer reveals your highest revs rating. Great to challenge friends and family. The perfect trainer for golfers and racket sports enthusiasts, but most commonly purchased by gadget lovers. Batteries (2 x LR41) to power Revometer included.
Internal gyroscopic ball produces immense forces the faster you twist your wrist. LCD Revometer records your exact RPM so you can challenge friends.
